[FIX] website: fix anchor selector not updating

Steps to reproduce the bugs:

- Add a banner on the homepage
- Click on the "create a link to target this section" button.
- Edit the anchor name to "bannerAnchor".
- Drop the image-text snippet.
- Double click on the button inside the snippet.
- Choose the homepage as the URL ("/")
- Open the "Page Anchor" select, choose "#bannerAnchor"
- Validate the changes.
- Double Click on the snippet button again.
- First bug: The URL properly shows "/#bannerAnchor" but the page anchor
select does not show anything.
- Open the page anchor select again.
- Second Bug: the "bannerAnchor" option does not appear as a choice.

This commit fixes the two bugs described above.

task-3378864

closes odoo/odoo#128345

X-original-commit: 62ed601bcf53fd6572118e742a5e27f7f3c7b6f6
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Signed-off-by: Benjamin Vray (bvr) <bvr@odoo.com>

addons/website/static/src/js/editor/widget_link.js

@@ -54,8 +54,19 @@ weWidgets.LinkTools.include({
         if ($selectMenu.data("anchor-for") !== urlInputValue) { // avoid useless query
             $pageAnchor.toggleClass('d-none', !isFromWebsite);
             $selectMenu.empty();
-            const always = () => $pageAnchor.find('we-toggler').text('\u00A0');
-            wUtils.loadAnchors(urlInputValue, this.$editable[0].ownerDocument.body).then(anchors => {
+            const always = () => {
+                const anchor = `#${urlInputValue.split('#')[1]}`;
+                let weTogglerText = '\u00A0';
+                if (anchor) {
+                    const weButtonEls = $selectMenu[0].querySelectorAll('we-button');
+                    if (Array.from(weButtonEls).some(el => el.textContent === anchor)) {
+                        weTogglerText = anchor;
+                    }
+                }
+                $pageAnchor[0].querySelector('we-toggler').textContent = weTogglerText;
+            };
+            const urlWithoutHash = urlInputValue.split("#")[0];
+            wUtils.loadAnchors(urlWithoutHash, this.$editable[0].ownerDocument.body).then(anchors => {
                 for (const anchor of anchors) {
                     const $option = $('<we-button class="dropdown-item">');
                     $option.text(anchor);